I used Ecover loo cleaner (Sage and Mint- smells lovely) for several months and became increasingly frustrated that despite assiduous brushing, the loos never looked really clean.
So I switched back to my old brand - Harpic White and Shine (other brands are available) and the problem went away.
It doesn’t need a lot and it doesn’t need it as often, so I would seriously dispute “so much of it”
I think I am more concerned about the “anti- bacterial” claims made for all sorts of products even plastic chopping boards which may be contributing to bacterial resistance.
From “Scientific American”:
When a bacterial population is placed under a stressor—such as an antibacterial chemical—a small subpopulation armed with special defense mechanisms can develop. These lineages survive and reproduce as their weaker relatives perish. "What doesn't kill you makes you stronger" is the governing maxim here, as antibacterial chemicals select for bacteria that endure their presence.
As bacteria develop a tolerance for these compounds there is potential for also developing a tolerance for certain antibiotics. This phenomenon, called cross-resistance, has already been demonstrated in several laboratory studies using triclosan, one of the most common chemicals found in antibacterial hand cleaners, dishwashing liquids and other wash products . "